basf acrylic acid process

Plant capacity is on the order of 50,000 metric tons per year of acrylic acid, with acetic acid produced as a salable by-product. In the region of the first cooling loop, the heat of condensation is removed externally via the first cooling loop by means of a heat exchanger with, for example, water as cooling medium, by removing condensed high boiler fraction from the column, cooling said fraction by means of the heat exchanger and recycling a part of the cooled, condensed, high boiler fraction to the column while the other part, usually less than 1% by weight, based on 100% by weight of condensate, in a side take-off, is removed. A product gas mixture resulting from a catalytic gas-phase oxidation of at least one C3 precursor compound to acrylic acid, comprising acrylic acid as a main product and glyoxal as a by-product is fed into the absorption column 12 as a stream 28. & Terms of Use. Preferably, the second cooling loop is arranged above the first cooling loop, the first cooling loop comprises a first chimney tray and the product gas mixture is fed into the absorption column below the first chimney tray. The present invention is described in more detail at hand of the accompanying drawings, in which: FIG. 5 further illustrates the dependency of the glyoxal concentration in weight ppm in the crude acrylic acid, shown on the ordinate 122, on the temperature in the second cooling loop, which is illustrated on the abscissa 120 in ° C. © 2004-2021 FreePatentsOnline.com. Prior to this recycling, it is appropriate to extract a portion with acid water. The circulation heat exchanger of the distillation unit is understood to mean an indirect heat exchanger present outside the distillation column. In contrast to a conventional condensation, a condensation in a column thus permits separation into the individual components. All rights reserved. The term “stripping” here shall comprise especially the stripping of low boilers out of the absorbate A by means of the stripping gases passed through the absorbate A, for example molecular oxygen, air, carbon dioxide and/or cycle gas, referring to for example, DE-A 10336386 and EP-A 925272. The absorption column 12, comprises three cooling loops 14, 16, 24. remove acrylic acid via batch adsorption process by using alumina. When the addition of acetic acid is accompanied by formation of solid precipitate, further acetic acid is added gradually in order to redissolve the precipitate formed, wherein the total amount of acetic acid added must not exceed 1.0 g. When the precipitate formed still has not gone into solution even on attainment of the limit of 1.0 g of the total amount of acetic acid addition allowed, 0.5 g of dimethyl phthalate is weighed in. A process for preparing aqueous solutions of homo- or copolymers of acrylic acid by means of free-radical polymerization of acrylic acid and optionally water-soluble, monoethylenically unsaturated comonomers in an aqueous medium in the presence of at least one water-soluble initiator and of at least one water-soluble regulator, where the amount of acrylic acid is at least 50% by weight based on the … This is in particular because the catalysts used as active materials for the partial oxidation are normally multimetal oxide materials comprising Mo, Bi and Fe and/or multimetal oxide materials comprising Mo and V. Owing to its water vapor content, the reaction mixture is capable, for example, of promoting the discharge of molybdenum oxides from the active materials. Advantageously in accordance with the invention, the boiling point of the absorbent at standard pressure is at least 20° C., preferably at least 50° C., more preferably at least 75° C. and most preferably at least 100° C. or at least 125° C. above the boiling point of acrylic acid, which is 141° C. at 1 atm, at the same pressure. By contacting the product gas mixture with the absorbent an absorbate A, comprising the absorbent and absorbed acrylic acid, is formed. Preferably, the product gas mixture is condensed at least partly in the absorption column. The part of the absorbent, which is withdrawn from the stripping section of the rectification column and recycled into the absorption column, preferably comprises a proportion by weight of acrylic acid of not more than 1% by weight. The pressure present in the adsorption column depends on the amount of uncondensable components and is preferably 0.5 to 5, in particular 0.8 to 3, bar absolute pressure. BASF plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers that can soak up large amounts of liquid and are used mainly in baby diapers and other hygiene products. Figure 1 depicts a propylene oxidation process similar to technology for the production of ester-grade acrylic acid (EAA) that was developed by Lurgi GmbH (Frankfurt, Germany; part of Air Liquide; Paris; www.airliquide.com) and Nippon Kayaku (Tokyo; www.nipponkayaku.co.jp). This can be effected by indirect cooling, for example by means of a heat exchanger, or by direct cooling with, as the cooling medium, high boiler fraction condensed in the next section of the column. Otherwise, the process for removal of acrylic acid from the product gas mixture of the heterogeneously catalyzed partial gas phase oxidation, appropriately in application terms, will be performed substantially following the specifications of DE-A 10336386. The analysis is effected by means of monochromatic radiation of wavelength 365 nm. It makes the key monomer by oxidizing propylene derived from the refining of crude oil. “3-HP is a potential key raw material for the production of bio-based acrylic acid which is a precursor of superabsorbent polymers,” said Teressa Szelest, Senior Vice President Global Hygiene Business at BASF. In the first plant, according to FIG. Further, 32 t/h of absorbate A were led through the first chimney tray towards the bottom space of the absorption column. 7 0 obj Suitable columns comprise at least one cooling apparatus, for which all conventional heat transfer apparatuses or heat exchangers in which the heat formed in the condensation is removed indirectly or externally are suitable. In a particularly preferred embodiment, the condensation of the reaction gas mixture takes place in absorption column as follows, it being possible to organize the absorption column in various sections in which the following different process functions are performed: The hot product gas mixture is passed into the bottom space and cooled. These metals include especially the metals Cr, Co, Cd, Fe, Mn, Mo, Ni, Sn, V, Zn, Zr, Ti, Sb, Bi and Pb, but also Al, Ca, Mg, K and Li. <> FIG. In August 2012, BASF, Cargill and Novozymes announced their joint agreement to develop a process for the conversion of renewable raw materials into a 100 percent bio-based acrylic acid. 3, the temperature in the second cooling loop was enhanced to a temperatures between 62° C. and 63.5° C. after approximately 14 months. In principle, the circulation heat exchanger used may be a natural circulation evaporator. Most acrylic acid is converted into commodity esters from crude acrylic acid (CAA),generally >97% purity. In August 2012, BASF, Cargill and Novozymes announced their joint agreement to develop a process for the conversion of renewable raw materials into a 100 percent bio-based acrylic acid. Suitable diethyl phthalate for this purpose is, for example, at least 99% by weight diethyl phthalate from BASF SE. Alternatively, it is possible to proceed as in DE-A 10251138. According to the invention, the temperature of the absorbate A in the second cooling loop 16 measured before its re-entrance into the absorption column 12 by the temperature sensor 36 is at least 56° C. By maintaining the temperatures in the second cooling loop of at least 56° C., a major part of the glyoxal present in the product gas mixture is separated off already in the absorption column 12 with a stream 38 of acid water. In August 2012, BASF, Cargill and Novozymes announced their joint agreement to develop a process for the conversion of renewable raw materials into bio-based acrylic acid. Possible sources for a metal contamination as described above include especially the catalyst bed used for the heterogeneously catalyzed partial gas phase oxidation and the manufacturing materials used for the equipment involved. The analysis method employed is absorption spectroscopy. Glacial Acrylic Acid or prop-2-enoic acid is the starting point for all other acrylics chemistry. With increasing temperature in cooling loop 2, the runtime between two shutdowns was increased to up to 50 days and less than 0.1 tons of polymer had to be removed during shutdowns. In the region between the side take-off and the second cooling loop, the medium boiler fraction from the gas stream fed countercurrent upward is concentrated, the medium boiler fraction being concentrated toward the side take-off. 8 0 obj It will be appreciated that it is also possible to use the materials recommended in WO 2005/007609. %PDF-1.6 The resulting solution is subsequently, likewise at a temperature of 25° C., stirred into 335 g of distilled water. If the product price decreases by 45% to $1.20/lb (the current market price of acrylic acid), the estimated IRR will be 45% with a NPV of $114,552,700 at a 15% discount rate. endobj In terms of apparatus, this preliminary cooling can be integrated in the bottom space of the absorption column with or without column baffles or can be separated from the column in a separate apparatus, for example a gas cooler, a quench apparatus or a flash pot. Addition of 0.5 g of glacial acetic acid, available for example from Aldrich with a purity of at least 99.8%, to the screwtop bottle subsequently freezes the hydrazone formation which has occurred. Absorbents which are particularly favorable in accordance with the invention are, for example, diphenyl ether, diphenyl, corresponding to biphenyl, mixtures, known as Diphyl® and consisting of 70% to 75% by weight of diphenyl ether and 25% to 30% by weight of diphenyl, and also dimethyl phthalate, diethyl phthalate and mixtures of a first constituent, the first constituent consisting of 70% to 75% by weight of diphenyl ether and 25% to 30% by weight diphenyl, and dimethyl phthalate or the first constituent, the first constituent consisting of 70% to 75% by weight of diphenyl ether and 25% to 30% by weight diphenyl, and diethyl phthalate or the first constituent, the first constituent consisting of 70% to 75% by weight of diphenyl ether and 25% to 30% by weight diphenyl, dimethyl phthalate and diethyl phthalate. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. Suitable operation conditions for the distillation unit are for example described in US 2011/0036704 A1. After the temperature increase, less than 0.1 tons of polymer had to be removed from the rectification column. Further, the process according to the invention should be performed such that the bottom liquid present in the bottom space of the absorption column has a minimum proportion by weight of heavy metals/heavy metal ions, especially transition metal ions, or of any metals/metal ions at all, since they can enhance the undesired polymerization tendency of acrylic acid. Acrylic monomers are all around us and form part of our everyday lives in diverse guises. BASF Brazil inaugurated its world-scale integrated production complex for acrylic acid, butyl acrylate and superabsorbent polymers (SAP) in Camacari, Bahia, Brazil, in June 2015. BASF is the world’s largest producer of acrylic acid. A process for production of acrylic acid comprising the following steps: a. preparation of a product gas mixture by a catalytic gas-phase oxidation of at least one C, Click for automatic bibliography This process is described in the next paragraphs. More preferably, a stream of the vapors, optionally after cooling and/or condensation thereof in an undirect heat exchanger, is recycled into the absorption column above the first chimney tray, most preferably above the second chimney tray. 12 0 obj This leadership position enables BASF to be a strong and reliable partner for its customers. The conventional method to produce acrylic acid is by the two-stage catalytic oxidation of propylene. More preferably, the absorption column comprises three cooling loops and a third cooling loop is arranged above the first cooling loop and the second cooling loop. 1 and 2 were each operated at inventive and comparative temperature conditions concerning the temperature in the second cooling loop. In addition to its indispensable permeability for gas ascending from the bottom upward in the absorption column, the chimney tray also has limited permeability to liquid accumulating thereon. The process water taken from BASF Petronas Chemicals Sdn Bhd containing 4% acrylic acid is used as sample water in this study. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. The adsorption column preferably has baffles which effect separation, in particular having packings and/or trays, preferably bubble trays, sieve trays, valve trays and/or dual-flow trays. High-boiling absorbents are understood to mean absorbents whose boiling point at standard pressure is above that of acrylic acid. In the region of the second cooling loop, the low boiler fraction from the gas stream fed countercurrent upward is condensed. 4 additionally represents the glyoxal concentration in the crude acrylic acid in weight ppm. An absorbate A is formed in an absorption column 12 and purified by stripping in a stripping unit 44. 3 and 4 show the results from the examples and comparative examples. Preferably, the absorbent is a high-boiling adsorbent. <>/XObject<>/ExtGState<>/ColorSpace<>>>/Tabs/S/StructParents 6>> To this end, 2.0 g of a 50% by weight solution of 2,4-dinitrophenylhydrazine, available for example from Aldrich with a purity of at least 97%, are dissolved at a temperature of 25° C. in 62 ml of a 37.0% by weight aqueous hydrochloric acid, available for example from Aldrich with a purity of at least 99.999%. <>/XObject<>/ExtGState<>/ColorSpace<>>>/Annots[88 0 R 89 0 R 90 0 R 91 0 R 92 0 R 93 0 R 94 0 R 95 0 R 96 0 R 97 0 R 98 0 R 99 0 R 100 0 R 101 0 R 102 0 R 103 0 R 104 0 R 105 0 R 106 0 R 107 0 R 108 0 R 109 0 R 110 0 R 111 0 R 112 0 R 113 0 R 114 0 R 115 0 R 116 0 R 117 0 R 118 0 R 119 0 R 120 0 R 121 0 R 122 0 R 123 0 R 124 0 R 125 0 R 126 0 R 127 0 R 128 0 R 129 0 R 130 0 R 131 0 R 132 0 R 133 0 R 134 0 R 135 0 R]/Tabs/S/StructParents 3>> After stirring at 25° C. for 1 hour, the derivatization solution D is obtained by filtration as the resulting filtrate. endobj x�+� � | During this time, the 2,4-dinitrophenylhydrazine, however, also removes the monomeric glyoxal, in the form of the hydrazone H, bound reversibly in the hemiacetals and/or acetals of glyoxal which are present in the screwtop bottle and contain monomeric glyoxal bound reversibly therein (in contrast, there is essentially no corresponding removal of monomeric glyoxal from hemiacetals and/or acetals with essentially irreversible glyoxal formation). BASF is the world´s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. <> BASF is the world´s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. 4, the temperature in the second cooling loop was increased from 52° C. to more than 57° C. At initial low temperature conditions a shutdown had to be effectuated approximately every 20 days. 3 0 obj The boiling point of these high-boiling secondary constituents is, both at standard pressure and under the conditions of the distillation, typically above that of the absorbent. endobj BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. Currently, acrylic acid is produced by the oxidation of propylene derived mainly from the refining of crude oil. Presently, acrylic acid … After the air cooler 26 and before the withdrawn portion of the absorbate A is recycled from the second cooling loop 16 into the absorption column 12, the temperature of the cooled portion of the absorbate A is measured by a temperature sensor 36. The second cooling loop preferably comprises a second chimney tray. Then 1 g of the derivatization solution D is weighed into a screwtop bottle with a capacity of 10 ml. Acrylic acid is a high-volume chemical that feeds into a broad range of products. 1 shows an absorption column applicable in the inventive process. Since, owing to the impurities and diluent gases, the gas mixture contains a high boiler, medium boiler and low boiler fraction and uncondensable components, one or more side take-offs can be provided at the appropriate points in the column. In the first cooling loop 1500 t/h of absorbate A were withdrawn from the absorption column, cooled to a temperature of 160° C. and recycled back into the absorption column. Privacy Policy The runtime in days between two shutdowns and amount of polymer, which had to be removed during the shutdown, as well as the glyoxal concentration in the crude acrylic acid is represented in dependency of the temperature in the second cooling loop. Acrylic acid is removed via the side take-off. The process is predicted to become profitable in year 3. The conventional method to produce acrylic acid is by the two-stage catalytic oxidation of propylene. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. On the second chimney tray a volume of approximately 30 m3 of the absorbate A were collected, having a temperature of 77.7° C. and the following composition: From the third cooling loop 374 t/h of the absorbate A were recycled into the absorption column with a temperature of 25° C. and further above 212 t/h of the absorbate A from the third cooling loop, used for evaporation of propylene, were recycled into the absorption column with a temperature of 15.9° C. From the third chimney tray, 12 t/h of acid water with a temperature of 40° C. were withdrawn from the absorption column and further conducted to an acid water extraction. Greater loadings do not present any difficulties. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. The retention time of the glyoxal as the hydrazone H is 7.613 min under the above conditions. GAA and the its acrylates are used as the components for polymers used in adhesives, coatings, inks, plastics, elastomers, water treatment, personal care, and various other industries. Preferably, in the distillation column, the bottom liquid of the absorption column fed to the distillation unit is separated by distillation into vapor, in which the proportion by weight of absorbent is greater than the proportion by weight of absorbent in the bottom liquid of the absorption column, and into liquid concentrate, in which the proportion by weight of constituents with higher boiling point than the absorbent, under distillation conditions, is greater than the proportion by weight of these constituents in the bottom liquid of the absorption column. The uncondensed components, which are preferably nitrogen, carbon monoxide, carbon dioxide, oxygen, methane, propane and propene, are removed from the top of the absorption column. Quenching was effectuated in a separate quenching column, corresponding to the bottom space of the absorption column, wherein 240 t/h product gas mixture from a synthesis unit were directly cooled with 1100 t/h of the bottom liquid of the absorption column. d) introducing a feed stream F comprising at least part of the absorbate A into a rectification column comprising a rectifying section and a stripping section. The exact operating conditions for the column, such like pressure, connection and arrangement of the cooling apparatus(es), arrangement of the side take-off/side take-offs for removing acrylic acid, choice of the column height and of the column diameter, number and spacing of the baffles/trays effecting separation in the column or type of column baffles effecting separation, can be determined by a person skilled in the art in experiments customary in the field, depending on the separation task. BASF initially plans to use the bio-based acrylic acid to manufacture superabsorbent polymers. 5 0 obj In general, the water vapor content of the starting reaction gas mixture will, however, not be more than 40% by weight, frequently not more than 30% by weight. “After just 18 months we have selected the preferred process to convert 3-HP into glacial acrylic acid. <>stream BASF is the world´s largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. These primary and secondary spaces are separated from one another by a heat transfer wall, through which the heat is transferred. 3 is assigned to a first plant and FIG. In principle, however, it is also possible to strip as in EP-A 1041062. On the third chimney tray a mass of approximately 30 tons of the absorbate A were collected, having a temperature of 40° C. and the following composition: FIGS. l of the catalyst bed with the C3 precursor compound. On each chimney tray 18, 32, 34 a portion of the absorbate A is collected, withdrawn from the absorption column 12, cooled and recycled into the absorption column 12 above the respective chimney tray 18, 32, 34, where the portion has been withdrawn. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. From a bottom space 22 of the absorption column 12 a stream 40 is withdrawn, which is partly recycled with a stream 30 into bottom space 22 of the absorption column 12 above an entrance of a stream 28 comprising the product gas mixture. When the stripping is performed in the form of stripping out with a stripping gas, a suitable stripping column is especially a tray column. %���� & Terms of Use. BASF is the world's largest producer of acrylic acid and has substantial capabilities in its production and downstream processing. BASF, Cargill and Novozymes announced the achievement of an important milestone in their joint development of technologies to produce acrylic acid from renewable raw materials by … The process according to the invention therefore is of relevance not least when the starting reaction gas mixture used for the heterogeneously catalyzed partial gas phase oxidation of the C3 precursor compound comprises preferably at least 1% by weight, more preferably at least 3% by weight of water vapor. A shutdown was necessary regularly after 10 to 20 days for polymer removal. At home, in the office, on the street or at the supermarket – applications and end products based on acrylic monomers can be found everywhere, from paints and lacquers to adhesives, water treatment products and plastics to detergents or textile fibers. US3002017A US826768A US82676859A US3002017A US 3002017 A US3002017 A US 3002017A US 826768 A US826768 A US 826768A US 82676859 A US82676859 A US 82676859A US 3002017 A US3002017 A US 3002017A Authority US United States Prior art keywords acrylic acid temperature homopolymer cooled beta Prior art date 1959-07-13 Legal status (The legal status is an assumption … It is the company’s first acrylic acid and SAP production complex in South America. an acrylic acid price of $1.75/lb. Subsequently, a sample of the liquid phase to be analyzed, the amount of which is in the range from 0.15 g to 2.0 g, is weighed into the screwtop bottle thus filled. A process for production of acrylic acid comprising the following steps: a. preparation of a product gas mixture by a catalytic gas-phase oxidation of at least one C 3 precursor compound to acrylic acid, wherein acrylic acid is formed as a main product of the catalytic gas-phase oxidation and glyoxal is formed as a by-product and the product gas mixture comprises acrylic acid and glyoxal, b. cooling of … generation, PROCESS FOR PURIFYING REMOVAL OF ACRYLIC ACID, METHACRYLIC ACID, N-VINYLPYRROLIDONE OR P-XYLENE CRYSTALS FROM THEIR SUSPENSION IN MOTHER LIQUOR, Anti-Inflammatory and Anti-Allergy Extracts from Nettle, METHODS TO RADIOLABEL NATURAL ORGANIC MATTER BY REDUCTION WITH HYDROGEN LABELED REDUCING AGENTS, Recovering method of acetic acid from effluent of terephthalic acid production process, BIO-BASED POLYETHYLENE TEREPHTHALATE PACKAGING AND METHOD OF MAKING THEREOF, Tri(Hydroxymethyl)Methylamine Salt or an Ethanol Amine Salt of (2S)-2-Ethoxy-3-(4-PHENYL) Propanoic Acid, METHOD TO MODULATE HEMATOPOIETIC STEM CELL GROWTH, Acetyl L-Carnitine For Preventing Painful Peripheral Diabetic Neuropathy, OZONIZED BIOCHAR COMPOSITIONS AND METHODS OF MAKING AND USING THE SAME. The materials used for the equipment involved are especially those recommended in DE-A 10336386. BASF has now joined the collaboration to develop the process for conversion of 3-HP into acrylic acid. A larger distance between two vertical lines indicates that longer runtimes between two shutdowns were possible. It has also already been proposed to obtain the propylene as the C3 precursor compound by a partial dehydrogenation and/or oxydehydrogenation of propane preceding the partial gas phase oxidation as described in for example WO 076370, WO 01/96271, EP-A 117146, WO 03/011804 and WO 01/96270. Suitable cooling media are air in the corresponding air coolers and cooling liquids, in particular water, in other cooling apparatuses. When low boilers are stripped out of the absorbate A withdrawn from the absorption column in a stripping unit, an absorbate A* is obtained, which is depleted of low boilers and which is subsequently sent to the rectification column with rectifying section and stripping section, in order to enrich the acrylic acid in the rectifying section of this rectification column and to conduct it out of the rectifying section as crude acrylic acid. For the process according to the invention, particular preference is also given to absorbents which consist to an extent of at least 70% by weight of those organic molecules which do not comprise any externally active polar groups and are therefore, for example, incapable of forming hydrogen bonds. 4, additionally, the glyoxal concentration in weight ppm is shown by horizontal lines 117. The company plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. On the abscissas 100, 110, the time is shown in months, wherein at the ordinates 102, 112, the runtime between two shutdowns is represented in days and the temperature in the second cooling loop is shown in ° C. The abscissa 112 in FIG. In the lower part of the column, the trays are especially dual-flow trays, and in the upper part of the column they are especially valve trays. 10 0 obj The residual gas remaining in the acid water condensation is generally partly recycled into the gas phase partial oxidation as diluent gas, partly incinerated and partly used as stripped gas for the stripping of low boilers out of the absorbate A. The world´s largest producer of acrylic acid plans initially to use the bio-based acrylic acid to manufacture superabsorbent polymers. Furthermore, the catalysts are solids which are subject to a certain degree of weathering in the course of the operating time. For this purpose, it is treated by means of the derivatization solution D as described above and then subjected to the HPLC analysis described. BASF is one of the largest producers of crude acrylic acid (CAA). The second cooling 16 comprises an air cooler 26 and a temperature sensor 36. <>/SpiderInfo 279 0 R>> This route can likewise be taken in the context of the inventive process. In general, the boiling point of the absorbent used for the process according to the invention at standard pressure is at values of at least 400° C., frequently at least 350° C. and in many cases also at least 300° C. or at least 280° C. In a manner particularly suitable for the process according to the invention, the boiling point of the absorbent used for the process according to the invention, at standard pressure, is at values in the range from 200° C. to 350° C., preferably in the range from 200° C. to 300° C. For example, useful absorbents include all of those which satisfy the aforementioned boundary conditions and are recommended in the documents DE-A 103 36 386, DE-A 024 49 780, DE-A 196 27 850, DE-A 198 10 962, DE-A 043 08 087, EP-A 0 722 926 and DE-A 044 36 243. On the secondary ordinates 103, 113, the amount of polymer, which had to be removed at each shutdown, is given in tons. The cooling liquid enters the absorption column 12 as a stream 30. In the plants, the absorption column comprised 13 fixed valve trays between the first and the second chimney tray and 21 fixed valve trays between the second and the third chimney tray. 2 shows a flow chart of a preferred embodiment of the inventive process, FIGS. 3 and 4 show the runtime between two shutdowns and the temperature in the second cooling loop in two different plants and. The absorbate A is introduced in the top region of the stripping column, and the stripping gas is, appropriately in application terms, conducted into the stripping column below the lowermost dual-flow tray and above the liquid level. A first portion of the stream 40 is applied as cooling liquid and fed back to the absorption column 12 in the stream 30. Acrylic Acid Process Background The plant at which you are employed currently manufactures acrylic acid in Unit 300 by the catalytic oxidation of propylene. First, a derivatization solution D is prepared. BASF will now develop the process for conversion of 3-HP into acrylic acid. endobj During this time, the corresponding hydrazone H of monomeric glyoxal forms from the monomeric glyoxal present in the screwtop bottle by chemical reaction with 2,4-dinitrophenylhydrazine. , FIG indicate the number of days of the crude acrylic acid by! Grey squares 106, 116 stand for the equipment involved are especially recommended! Commonly used processes are based on Nippon Shokubai, basf, Cargill and Novozymes will develop bio-based technologies produce! Bed with the absorbent is withdrawn as a stream 40 is applied as cooling and... Is obtained by filtration as the resulting filtrate, with acetic acid as. Loop in two different plants and withdrawn as a stream 42 heat exchangers have at partly! Loop 16 and a temperature sensor 36 salable by-product represent the temperature the! 12, applicable in the second cooling loop preferably comprises a chimney tray CG ) propylene is with. To DIN EN 10020:2000-07, advantageously with a very smooth surface to manufacture superabsorbent polymers be described as tray..., less than 0.1 tons of polymer had to be removed at the corresponding.! Squares 106, 116 stand for the amount of 1 g of distilled.. Loop 14, 16, 24 comprises a first plant, FIG especially those recommended in WO 2005/007609 the of! A shutdown was necessary regularly after 10 to 20 days for polymer removal in US 2011/0036704 A1 and for... These primary and secondary spaces are separated from one another by a transfer. Takes place in a column thus permits separation into the individual components the condensation of propylene derived the. Directly or indirectly in step b ) before the condensation the context of the inventive process preferably 1.4571 to! Third chimney tray 18, 32, 34 as fractions by cooling the chimney... Phthalate for this purpose is, for example, the stripping section and enriching acrylic and! One primary space and at least partly in the corresponding air coolers are preferred also! Is transferred presently, acrylic acid and has substantial capabilities in its production and downstream processing 114 represent temperature. The resulting filtrate derivatization solution D is obtained by filtration as the hydrazone H is 7.613 min under above. Temperature, amount of alumina and contact time between basf acrylic acid process shutdowns … monomers. That the by-production of glyoxal hydrates it is also possible to strip as in EP-A 1041062 transfer wall through! An absorption column 12 in the second cooling 16 comprises an air cooler 26 be!, part of the distillation column and a temperature of the runtime between shutdowns! A fixed-bed, shell-and-tube reactor in series 0.1 tons of polymer in tons, which withdrawn! % acrylic acid is produced by the oxidation of propylene derived mainly from the examples and comparative temperature concerning! Circulation evaporator the reaction gas mixture from step ( a ) are condensed as by... Position enables basf to be removed at the corresponding shutdown one of absorbent... Liquid which accumulates thereon, for example, the low boiler fraction is fed upward., FIG Sdn Bhd containing 4 % acrylic acid is converted into commodity esters from crude acrylic is. Absorbent and absorbed acrylic acid acid via batch adsorption process by using alumina back to the remarks in 4308087... Precooled product gas mixture entering the absorption column 12 comprises a chimney tray 18,,... Loop before re-entering the absorption column 12 by quenching with a cooling liquid the... With the reaction gas mixture from step ( a ) are condensed as fractions by.... Applied as cooling liquid enters the absorption column applicable in the context of the derivatization D! A heat transfer wall, through which the heat is transferred on Nippon Shokubai, basf Cargill! With a very smooth surface to convert 3-HP into glacial acrylic acid or prop-2-enoic acid is by the oxidation propylene. Residual gas to be supplied to the absorption column 12 and purified by stripping in a corresponding manner oil! Temperature, amount of alumina and contact time start-up OPX Biotechnologies a in the second chimney tray the! Runtime between two shutdowns makes the key monomer by oxidizing propylene derived from the of.

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